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Title: High-pressure structural transformations of PbCrO{sub 4} up to 51.2 GPa: An angle-dispersive synchrotron X-ray diffraction study

Highlights: • PbCrO{sub 4} was studied under high pressure up to 51 GPa using synchrotron powder XRD. • The occurrence of three phase transitions is reported. • The crystal structures of the high-pressure phases are assigned. • Axial and bulk compressibilities are determined. - Abstract: We report on high-pressure X-ray diffraction measurements up to 51.2 GPa in PbCrO{sub 4} at room temperature. Three high-pressure phases with structures different than the ambient-pressure monazite-type (P2{sub 1}/n) are reported. One phase transition was found at 3.8 GPa to an isomorphic structure to monazite. A second transition occurs at 11.1 GPa. After this transition, the coexistence of tetragonal (I4{sub 1}/a) and monoclinic (P2{sub 1}) structures is detected up to 21.1 GPa. Beyond this pressure and up to 51.2 GPa, only the high-pressure monoclinic phase is observed. Upon decompression all structural changes are reversible. Finally, the axial compressibilities for the different phases have been determined as well as the equations of state.
Authors:
 [1] ;  [2]
  1. Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia (Spain)
  2. High Pressure Science and Engineering Center, Department of Physics and Astronomy, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, Nevada 89154-4002 (United States)
Publication Date:
OSTI Identifier:
22420668
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CHROMATES; COMPRESSIBILITY; EQUATIONS OF STATE; LEAD COMPOUNDS; MONAZITES; MONOCLINIC LATTICES; PHASE TRANSFORMATIONS; POWDERS; PRESSURE DEPENDENCE; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0273-0400 K; TETRAGONAL LATTICES; X-RAY DIFFRACTION